chap7_7.html
来自「Oracle资料大集合」· HTML 代码 · 共 362 行
HTML
362 行
<HTML><HEAD><TITLE>Oracle8 How-To</TITLE><SCRIPT><!--function displayWindow(url, width, height) { var Win = window.open(url,"displayWindow",'width=' + width +',height=' + height + ',resizable=1,scrollbars=yes');}//--></SCRIPT></HEAD><BODY BACKGROUND="../../../images/curve_itlibrary_white.gif" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#DD0000" VLINK="#999999" ALINK="#FF0000"><!--Begin Header Table --><TABLE width="640" cellpadding="0" cellspacing="0" border="0"><TR><TD VALIGN="TOP" WIDTH="640" COLSPAN="3"><A HREF="http://www.earthweb.com" target="resource window"><IMG SRC="../../../images/eweb_banner.gif" VSPACE="6" WIDTH="640" HEIGHT="25" ALT="Brought to you by EarthWeb" border="0"><BR></a></TD></TR><TR><TD VALIGN="TOP" WIDTH="150"><A HREF="http://www.itlibrary.com/"><IMG SRC="../../../images/small_logo.gif" WIDTH=103 HEIGHT=82 ALT="IT Library Logo" border="0"></a><P><!--Begin Subscribe Box Table --><TABLE border="0" cellpadding="0" cellspacing="0" WIDTH="100"><TR><TD></TD></TR></TABLE><!--End Subscribe Box Table --></td><TD><img src="../../../images/dotclear.gif" WIDTH="15" HEIGHT="1"></TD><TD><!-- Begin Ads itl //--><a href="http://www.itlibrary.com/adclick.html/CID=00000349829b438e00000000/site=itlibrary/area=itl/aamsz=468x60" TARGET="new win"><img src="../../../../adimages.earthweb.com/images/ads/spidercatcher.gif@10507" ALT="Click Here!" border="0"><BR><CENTER>Click Here!</CENTER></a><!-- itl End Ads //--></td></TR></TABLE><!--End Header Table --><!--Begin Main Table --><TABLE width="640" cellpadding="0" cellspacing="0" border="0"><TR><!--Begin Left Navigation column --><TD VALIGN="TOP" WIDTH="140"><FORM action="/subscribe/list.cgi" method="post"><INPUT name='email' value='your e-mail' size="11"><INPUT type='hidden' name='state' value='Subscribe'><br><INPUT type='image' value='subscribe' img src='/images/subscribe.gif' border='0' vspace='3' ></center></form><form name="Search" method="GET" action="http://search.earthweb.com/search97/search_redir.cgi"><INPUT TYPE="hidden" NAME="Action" VALUE="Search"><INPUT TYPE="hidden" NAME="SearchPage" VALUE="http://search.earthweb.com/search97/samples/forms/srchdemo.htm"><INPUT TYPE="hidden" NAME="Collection" VALUE="Site Index"><INPUT TYPE="hidden" NAME="ResultTemplate" VALUE="itl.hts"><INPUT TYPE="hidden" NAME="ViewTemplate" VALUE="view.hts"></font><table width=130 border=0 cellpadding=0 cellspacing=0><tr><td><font face="arial, helvetica" size=2 color="white"><b>Search the site:</b></font><br><INPUT NAME="queryText" size=8 VALUE=""> <input type="submit" name="submitbutton" value="Go!"></td></tr><INPUT type=hidden NAME="section_on" VALUE="on"><tr><td><SELECT NAME="section" size=1><option value="../../../../www.itlibrary.com/default.htm" SELECTED>ITLibrary<option value="../../../../www.itknowledge.com/default.htm">ITKnowledge</SELECT><a href="http://www.itlibrary.com/search/"><font face="arial, helvetica" color=FFFFFF size=1>EXPERT SEARCH</a></font><IMG src="../../../images/rule.gif" width="100" vspace=3 height="2" ALT="-----"></form></td></tr></table><table bgcolor="#cc9900" cellpadding="0" cellspacing="0" border="0" width=110><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><b><a href="http://www.itlibrary.com/reference/dir.programminglanguages.html"><font face="verdana,helvetica" size="1" color="000000">Programming Languages</font></a></b></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=12 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.databases.html"><font face="verdana,helvetica" size="1" color="000000"><b>Databases</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=12 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.security1.html"><font face="verdana,helvetica" size="1" color="000000"><b>Security</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=12 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.webservices.html"><font face="verdana,helvetica" size="1" color="000000"><b>Web Services</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=12 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.networkservices1.html"><font face="verdana,helvetica" size="1" color="000000"><b>Network Services</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=12 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.middleware.html"><font face="verdana,helvetica" size="1" color="000000"><b>Middleware</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=12 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.components.html"><font face="verdana,helvetica" size="1" color="000000"><b>Components</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=6 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.operatingsystems.html"><font face="verdana,helvetica" size="1" color="000000"><b>Operating Systems</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=6 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.userinterfaces.html"><font face="verdana,helvetica" size="1" color="000000"><b>User Interfaces</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=6 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.groupwareandcollaboration1.html"><font face="verdana,helvetica" size="1" color="000000"><b>Groupware & Collaboration</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=6 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.contentmanagement.html"><font face="verdana,helvetica" size="1" color="000000"><b>Content Management</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=6 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.productivityapplications1.html"><font face="verdana,helvetica" size="1" color="000000"><b>Productivity Applications</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=6 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.hardware1.html"><font face="verdana,helvetica" size="1" color="000000"><b>Hardware</b></font></td></tr><tr><td colspan="2"><img src="../../../images/dotclear.gif" width=6 height=12 alt="" border="0"></td></tr><tr><td><img src="../../../images/arrow.gif" width=10 height=17 alt="" border="0"></td><td><a href="http://www.itlibrary.com/reference/dir.funandgames1.html"><font face="verdana,helvetica" size="1" color="000000"><b>Fun & Games</b></font></td></tr></table><!-- <IMG SRC="/images/leftnav.gif" WIDTH=111 HEIGHT=404 ALT="nav" border="0" ISMAP USEMAP="#leftnav"> --><p><a href="http://www.earthweb.com/jobs/" target=new><IMG SRC="../../../images/dice-105x30.gif" WIDTH=105 HEIGHT=30 ALT="EarthWeb Direct" border="0"></a><a href="http://www.earthwebdirect.com/" target=new><IMG SRC="../../../images/earthwebdirect.gif" WIDTH=105 HEIGHT=30 ALT="EarthWeb Direct" border="0"></a><a href="http://www.fatbrain.com/home.html?from=UUX592" target=new><IMG SRC="../../../images/fatbrain.gif" WIDTH=105 HEIGHT=30 ALT="Fatbrain" border="0"></a><a href="http://auctions.earthweb.com" target=new><IMG SRC="../../../images/auctions_105x30.gif" WIDTH=105 HEIGHT=30 ALT="Auctions" border="0"></a><a href="http://www.supportsource.com" target=new><IMG SRC="../../../images/ss2000sneak2.gif" WIDTH=105 HEIGHT=30 ALT="Support Source Answers" border="0"></a><P><b><font face="verdana,helvetica" size="2">EarthWeb sites</FONT></b><br> <FONT SIZE="1"> <a href="http://www.crossnodes.com"><font face="verdana,helvetica" size="1" color="000000">Crossnodes</font></a><br> <a href="http://www.datamation.com"><font face="verdana,helvetica" size="1" color="000000">Datamation</font></a><br> <a href="http://www.developer.com"><font face="verdana,helvetica" size="1" color="000000">Developer.com</FONT></A><br> <a href="http://www.dice.com"><font face="verdana,helvetica" size="1" color="000000">DICE</font></a><br> <a href="http://www.earthweb.com"><font face="verdana,helvetica" size="1" color="000000">EarthWeb.com</font></a><br> <a href="http://www.earthwebdirect.com"><font face="verdana,helvetica" size="1" color="000000">EarthWeb Direct</font></a><br> <a href="http://www.erphub.com"><font face="verdana,helvetica" size="1" color="000000">ERP Hub</font></a><br> <a href="http://www.gamelan.com"><font face="verdana,helvetica" size="1" color="000000">Gamelan</font></a><br> <a href="http://www.gocertify.com"><font face="verdana,helvetica" size="1" color="000000">GoCertify.com</font></a><br> <a href="http://www.htmlgoodies.com"><font face="verdana,helvetica" size="1" color="000000">HTMLGoodies</font></a><br> <a href="http://www.intranetjournal.com"><font face="verdana,helvetica" size="1" color="000000">Intranet Journal</font></a><br> <a href="http://www.itknowledge.com"><font face="verdana,helvetica" size="1" color="000000">IT Knowledge</font></a><br> <a href="http://www.itlibrary.com"><font face="verdana,helvetica" size="1" color="000000">IT Library</font></a><br> <a href="http://www.javagoodies.com"><font face="verdana,helvetica" size="1" color="000000">JavaGoodies</font></a><br> <a href="http://www.jars.com"><font face="verdana,helvetica" size="1" color="000000">JARS</font></a><br> <a href="http://www.javascripts.com"><font face="verdana,helvetica" size="1" color="000000">JavaScripts.com</font></a><br> <a href="http://www.opensourceit.com"><font face="verdana,helvetica" size="1" color="000000">open source IT</font></a><br> <a href="http://www.roadcoders.com"><font face="verdana,helvetica" size="1" color="000000">RoadCoders</font></a><br> <a href="http://www.Y2Kinfo.com"><font face="verdana,helvetica" size="1" color="000000">Y2K Info</font></a></FONT></td><!--End Left Navigation column --><!-- spacer column --><TD width="40"><img src="../../../images/dotclear.gif" WIDTH="40" HEIGHT="1" border=0></TD><!--Begin Content Column --><TD VALIGN="TOP" width="500"><P><blockquote><b><font size="+1">7.7 How do I匢mplement record level security using views?</font></b><p><B>Problem</B><p>We have certain tables that are used throughout the organization. We want all users to work with the same table, but only see the data for their job function. I know that I can use views to query selective data, but how do I restrict access to data on a record level using views?<p><B>Technique</B><p>The USER pseudo-column contains the account of the user connected to the database. Most pseudo-columns can be used in views. The USER pseudo-column can restrict access to certain users, and the SYSDATE pseudo-column can restrict access from old data. Subqueries can be used to produce lists of valid values within an IN operator.<p><B>Steps</B><p><B>1.</B> Run SQL*Plus and connect as the WAITE user account. CHP7_20.SQL, shown in <A HREF="image/07oht12.gif" TARGET="_blank">Figure 7.12</A>, contains a CREATE TABLE statement for building a table that will be restricted by a view.<p>The SALES_ID column contains the name of the user account that creates the record. The ORDER_DATE column contains the date the order is placed, and the ORDER_DESC column describes the order.<p><B>2.</B> Run the statement to create the table.<P><code><b>SQL> START CHP7_20.sql<p>Table created.</b></code><p><B>3.</B> Load CHP7_21.SQL into the SQL buffer. The file contains a statement to restrict data based on the ORDER_DATE column. In this example, the customer service department can only work with orders that have an order date of today or later.<p><code><b>SQL> GET CHP7_21.sql<p>1 CREATE OR REPLACE VIEW SALES_VIEW07 AS<p>2 SELECT SALES_ID,<p>3 ORDER_DATE,<p>4 ORDER_DESC<p>5 FROM<p>6 SALES07<p>7 WHERE<p>8* ORDER_DATE < SYSDATE</b></code><p>Line 1 contains the CREATE OR REPLACE VIEW keywords to build the view and provides the name of the view. Lines 2 through 8 contain the query that generates the view抯 records. The WHERE clause in lines 7 and 8 specifies that the view will only return records where the ORDER_DATE column is less than the SYSDATE.<p><B>4.</B> Run the statement to create the view.<p><code><b>SQL> /<p>View created.</b></code><p><B>5.</B> Load CHP7_22.SQL into the SQL buffer. The file contains a statement to insert a sample record into the table.<P><code><b>SQL> GET CHP7_22.sql<p>1 INSERT INTO SALES07 (<p>2 SALES_ID, ORDER_DATE, ORDER_DESC)<p>3 VALUES<p>4* (USER, SYSDATE+5, 慒IVE DAYS LATER⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?